DAFTAR ISI
HALAMAN JUDUL.......................................................................... i HALAMAN PENGESAHAN ............................................................ ii SURAT SELESAI MAGANG ........................................................... iii SURAT PERNYATAAN................................................................... iv MOTTO.............................................................................................. v HALAMAN PERSEMBAHAN......................................................... vi PRAKATA ......................................................................................... vii DAFTAR ISI ...................................................................................... x DAFTAR GAMBAR ......................................................................... xiv DAFTAR TABEL .............................................................................. xviii INTISARI........................................................................................... ix ABSTRACT ....................................................................................... xx BAB I PENDAHULUAN A. Latar Belakang Masalah……………………………………….. 1 B. Perumusan masalahan………………………………………..... 2 C. Maksud danTujuan…………………………………………..... 3 D. Batasan Masalah…………………………….............................. 3 E. Metode Pengumpulan Data……………………………………. 4 F. Sistematika Penulisan………………………………….. ........... 5 BAB II LANDASAN TEORI A. Motor Induksi Tiga Fasa. ............................................................ 7
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B. Konstruksi Motor Induksi Tiga Fasa .......................................... 8 C. Jenis Motor Tiga Fasa Dari Segi Rotor ...................................... 27 D. Prinsip Medan Putar.................................................................... 28 E. Prinsip Kerja Motor Induksi Tiga Fasa ....................................... 33 F. Kerusakan Pada Motor Induksi ................................................... 37 BAB III PROSES REWINDING DAN RESTACKING STATOR PADA MOTOR INDUKSI A. Incoming Inspection.………….………………………… .......... 41 B. Electrical Inspection…. .............................................................. 42 C. Dismantling.................................................................................. 47 3.4. Restacking.................................................................................... 50 3.5. Rewinding Process....................................................................... 54 F.
Overhoul rotor................................................ ............................ 65
G. Perakitan (Assembling)................................................ ............... 65 H. Akhir Pengecekan Electrical ....................................................... 66 I.
Running test ................................................................................ 67
J.
Pengecatan dan Packing ............................................................. 71
BAB IV DATA DAN ANALISIS A. Data Motor…….............................. ............................................ 72 B. Data Sebelum Perbaikan............................................................. 73 C. Data Winding.............................................................................. 79 D. Data Setelah Perbaikan...............................................................
84
E. Running Test Tanpa Beban......................................................... 94
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BAB V PENUTUP 5.1. Kesimpulan.................................................................................. 100 5.2. Saran............................................................................................ 100 DAFTAR PUSTAKA......................................................................... 103 LAMPIRAN ....................................................................................... 104
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DAFTAR GAMBAR
Gambar 2.1
Konstruksi Motor Induksi ...........................................................
9
Gambar 2.2
Lembaran Laminasi Stator .......................................................... 10
Gambar 2.3
Tumpukan inti dengan kertas isolasi tiap alurnya ....................... 10
Gambar 2.4
Belitan stator yang berada dalam cangkang silindris ................. 10
Gambar 2.5
Core Loss Test ............................................................................. 11
Gambar 2.6
Simbol group belitan ................................................................... 15
Gambar 2.7
Kumparan terpusat....................................................................... 18
Gambar 2.8
Kumparan gelung ........................................................................ 18
Gambar 2.9
Dacron Felt ................................................................................. 21
Gambar 2.10 Glass Tape ................................................................................... 22 Gambar 2.11 Captune Tape............................................................................... 22 Gambar 2.12 Mica Tape .................................................................................... 23 Gambar 2.13 Bagian slip ring rotor belitan....................................................... 25 Gambar 2.14 Skematik diagram motor induksi rotor belitan ............................ 25 Gambar 2.15 Rotor sangkar tupai dan bagian-bagiannya ................................. 26 Gambar 2.16 Jenis motor induksi tiga fasa ....................................................... 28 Gambar 2.17 Kumparan stator dihugungkan ke sumber 3 fasa ........................ 29 Gambar 2.18 Garis magnetik keadaan 1 ........................................................... 30 Gambar 2.19 Medan magnet dievaluasi pada interval 60 dari titik awal ........ 31 Gambar 2.20 Medan magnet diputar 60 dari keadaan 3 .................................. 32 Gambar 2.21 Medan magnet putar diputar satu putaran penuh 360 ................ 32 xiii
Gambar 2.22 Proses induksi medan putar stator pada kumparan rotor ............ 34 Gambar 2.23 Hukum Gaya lorentz ................................................................... 35 Gambar 3.1
Incoming motor .......................................................................... 42
Gambar 3.2
Megger ........................................................................................ 43
Gambar 3.3
Galvanometer ............................................................................. 45
Gambar 3.4
Monolitic ..................................................................................... 45
Gambar 3.5
Surge ........................................................................................... 46
Gambar 3.6
Typical surge test indications ..................................................... 47
Gambar 3.7
Striping ........................................................................................ 48
Gambar 3.8
Cleaning ...................................................................................... 49
Gambar 3.9
Restacking.................................................................................... 50
Gambar 3.10 Thermoimage ............................................................................... 52 Gambar 3.11 Core Loss Test ............................................................................. 52 Gambar 3.12 Proses pengovenan ...................................................................... 53 Gambar 3.13 Kondisi setelah pemberian pelapisan Red Oxyde ........................ 53 Gambar 3.14 Coil Fabrication .......................................................................... 55 Gambar 3.15 Proses pengemalan ...................................................................... 56 Gambar 3.16 Coil insulation ............................................................................. 57 Gambar 3.17 Proses pemasangan coil pada alur stator ..................................... 58 Gambar 3.18 Nomex dengan lapisan Corona .................................................... 59 Gambar 3.19 Nomex biasa ................................................................................. 59 Gambar 3.20 Wedges magnetic ......................................................................... 60 Gambar 3.21 Wedges fiber ................................................................................ 60 xiv
Gambar 3.22 Proses pemasangan wedges ......................................................... 60 Gambar 3.23 Jenis hubungan antar group untuk 4 pole .................................... 61 Gambar 3.24 Brazing flux ................................................................................. 62 Gambar 3.25 Silver ............................................................................................ 62 Gambar 3.26 Proses connecting winding ......................................................... 62 Gambar 3.27 Hasil connection dibungkus mica tape ........................................ 62 Gambar 3.28 Hasil pemvarnisan ....................................................................... 64 Gambar 3.29 Proses perakitan (Assembling)..................................................... 66 Gambar 3.30 Tang ampere ................................................................................ 68 Gambar 3.31 Vibrotip........................................................................................ 68 Gambar 3.32 Tachometer .................................................................................. 69 Gambar 3.33 Temperatur test ............................................................................ 70 Gambar 3.34 Anemometer ................................................................................ 70 Gambar 3.35 Hasil pengepackan ....................................................................... 71 Gambar 4.1
Name plate motor induksi PT Tjiwi Kimia Tbk .......................... 72
Gambar 4.2
Mengatur Test Volt dengan 2500 V ............................................ 76
Gambar 4.3
Hasil Surge 1-2 (U-V) ................................................................. 76
Gambar 4.4
Hasil Surge 2-3 (V-W) ................................................................ 76
Gambar 4.5
Hasil Surge 3-1 (W-U) ................................................................ 76
Gambar 4.6
Kondisi kerusakan belitan stator ................................................. 77
Gambar 4.7
Bekas ledakkan ............................................................................ 77
Gambar 4.8
Core Loss Test sebelum rewinding.............................................. 77
Gambar 4.9
Dimensi belitan stator .................................................................. 80 xv
Gambar 4.10 Connecting winding ..................................................................... 83 Gambar 4.11 Hasil visual menit ke 15 .............................................................. 84 Gambar 4.12 Hasil visual menit ke 30 .............................................................. 85 Gambar 4.13 Hasil visual menit ke 45 .............................................................. 85 Gambar 4.14 Hasil visual menit ke 60 .............................................................. 86 Gambar 4.15 Bagian-bagian yang dilakukan pengukuran ................................ 88 Gambar 4.16 Hasil visual pengujian surge ....................................................... 88 Gambar 4.17 Hasil visual pengukuran Hi Pot ................................................... 89
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DAFTAR TABEL
Tabel 4.1 Hasil Insulation Resistance Test sebelum perbaikan .................... 73 Tabel 4.2 Hasil Resistance Test sebelum perbaikan Hasil ............................ 74 Tabel 4.3 Hasil Surge Test sebelum perbaikan ............................................. 75 Tabel 4.4 Hasil Core Loss Test sebelum perbaikan ...................................... 77 Tabel 4.5 Hasil karakter pengujian Surge Test setelah perbaikan ................ 89 Tabel 4.6 Hasil Hi Pot Test setelah perbaikan .............................................. 89 Tabel 4.7 Hasil Tahanan isolasi lilitan dengan metode Polarization index .. 92 Tabel 4.8 Hasil Polarization Value ............................................................... 92 Tabel 4.9 Hasil tahanan lilitan....................................................................... 93 Tabel 4.10 Hasil Running Test ........................................................................ 94 Tabel 4.11 Hasil Vibration Test ...................................................................... 95 Tabel 4.12 Hasil Temperature Test ................................................................. 97 Tabel 4.13 Data Kenaikan Temperatur Lilitan ................................................ 98 Tabel 4.13 Data Pengujian Kecepatan Angin ................................................. 99
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